The responses of Pa, SPI, and SPEI to dry climate in alpine meadows of eastern Qinghai-Tibet Plateau

Xin-lai Zhao; Wen-long Li; Guo Xulin; Cui Yu; Yu-ting Zhao; Jing Xu

doi:10.11829/j.issn.1001-0629.2016-0187

Pratacultural Science > 2017 > 11(2): 273-282. > DOI: 10.11829/j.issn.1001-0629.2016-0187

Xin-lai Zhao, Wen-long Li, Guo Xulin, Cui Yu, Yu-ting Zhao, Jing Xu. The responses of Pa, SPI, and SPEI to dry climate in alpine meadows of eastern Qinghai-Tibet Plateau[J]. Pratacultural Science, 2017, 11(2): 273-282. DOI: 10.11829/j.issn.1001-0629.2016-0187

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The responses of Pa, SPI, and SPEI to dry climate in alpine meadows of eastern Qinghai-Tibet Plateau

1.
State Key Laboratory of Grassland Agro-ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730020, China
2.
Department of Geography and Planning, University of Saskatchewan, Saskatoon SKS7N5C8, Canada
3.
School of Agriculture and Forestry Economic and Management, Lanzhou University of Finance and Economics, Lanzhou 730020, China

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Received Date: April 11, 2016
Published Date: February 19, 2017

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Abstract

Abstract

Using precipitation and temperature data from 33 meteorological stations around Gannan in 1965-2013, the percentage of precipitation anomalies (Pa), standardized precipitation index (SPI), and standardized precipitation evapotranspiration index (SPEI) were calculated. To select a suitable index to describe dry climatic factors in alpine meadows, we analysed the response of these indexes to drought. In addition, verification was conducted by comparing historical disaster statistics with the drought indexes. The correlation analysis of SPI, SPEI, and Pa with grassland normalized difference vegetation index (NDVI) showed that the reaction of Pa, SPI1, SPEI1, SPI3, and SPEI3 to precipitation was too sensitive; however, SPI12 and SPEI12 were slightly hysteretic. SPI6 and SPEI6 were both well suited to quantitatively evaluating the dry climatic factors in this area. Based on historical statistics, two drought indexes were somewhat better. These results provide effective data in support of further research on drought risk analysis in alpine grasslands.
- alpine meadow,
- dry climatic factors,
- drought index

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The responses of Pa, SPI, and SPEI to dry climate in alpine meadows of eastern Qinghai-Tibet Plateau

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